Relief-valve.



No. 687,497. Patented Nov. 26, |90l. J. CURVILLE.

RELIEF VALVE.

(Application med Aug. 7, 1901.)

(No Model.)

Ia" C..

WTNESSES.

UNITED STATES PATENT OFFICE.

JOSEPH COURVILLE, OFIDETROIT, MICIIIGAN, ASSIGNOR TO FARRAND ORGAN COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

rzElnEi---vrxuvlnA SPECIFCATION forming part of Letters Patent No. 687,497, dated November 26, 1901.

Application tiled August 7,1901. Serial No. 71,204. (No model.)

To @ZZ whom t may concern:

Be it known that I, JOSEPH CoURvrLLE, a citizen of the United States, residing at Detroit, in the county of lVayne and State of Michigan, have invented certain new and useful Improvements in Relief-Valves, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to relief-valves, and is especially adapted for use in connection with foot-actuated Wind-pum ps of cabinet-organs or pneumatic self-playing attachments for pianos. Heretofore instruments of this kind have been provided with relief-valves which have usually been connected with a store-bellows or pressure-regulator.

The objects of the valve are, first, to guard against the development of too-great pressure acting upon the reed or sound-producing devices, and, second, to relieve the resistance to the pressure of the foot upon the pumpingpedal when the bellows is fully collapsed. The latter object is of greater importance in self-playing attachments for musical instruments in which an increased pressure will do no harm; but the resistance to the depression of the pedal will increase the effort of the performer. In the present invention this object is more perfectly accomplished by placing the relief-valve in direct connection with the pumping-bellows instead of the indirect connection through the store-bellows heretofore used.

In the drawings, Figure l is a front elevation showing the pumping-bellows and a portion of the store-bellows of an instrument. Fig. 2 is a cross-section therethrough. Fig. 3 is an enlarged section of a portion of Fig. 2, showing the parts in a different position.

A is a pumping-bellows of any ordinary construction, which is shown as mounted on a stationary inclined board B, also forming the support for the store-bellows C. The bellows A is actuated by connection with the pedal and is adapted to exhaust the air from the store-bellows C, causing the latter to collapse against the tension of the spring D. The air passes from the bellows C into the bellows A through valve-controlled ports E in the board B, and the movable front board of the bellows A is also provided with valve-controlled ports F.

G is the relief-valve which forms the subject-matter of the present invention. This may be arranged in any position in proximity to the bellows A, but as shown is arranged below the lower hinged edge of said bellows.

I-I is the port controlled by the valve, which, as shown7 is formed in the board B and connects directly with the space within the bellows.

immaterial; but a simple and effective arrangement is formed by the bar a, having a hinge b at one edge formed of iiexible material. The face of this bar normally covers the port I-I, which may be single or a series'of apertures, as shown. The valve is normally held closed by gravity and by the suction of the bellows A and is permitted to remain in this position until the store-bellows C is almost completely collapsed. For then opening the valve a lug or projection I upon the movable member of the store-bellows is arranged to impinge against an arm J, projecting from the Valve G, so as to force said valve from its seat andopen the ports II. Vhen this is accomplished, air will pass directly through the port II into the bellows E and will thereby relieve all resistance to the pedal K excepting that of the spring for returning the movable board of the bellows.

The principal advantage ofthe construction is the directness of the relief connection with the bellows A, and a further advantage is that the valve may be more conveniently placed as shown than upon the movable board of the store-bellows.

What I claim as my invention is l. The combination with a wind-pump and a store-bellows connected therewith, of a re-v .lief -valve normally closing a direct atmosn pheric connection with said pumping-bellows adapted to be opened by the abnormal movement of said store-bellows.

2. The combination with a suction windpump and a store-bellows connected therewith, of a relief-valve normally closing a direct atmospheric connection with said pump- The precise construction of the valve G is y ing-bellows and meansfol1 openingsaid valve l of a Cooperating shoulder on the movable upon the collapsing of said store-bellows; memberof said store-bellows,whereby the col- 3. The combination Withastationmyboard lapsng of the latter will Actuate said Valve having a pumping-bellows mounted upon one and open said port.

5 side thereof and a store-bellows upon the op- In testimony whereof l affix my signature I5 positeside thereof, of a Valve seated upon in presence of two Witnesses. said board adjacent to said pumping-bellows JOSEPH COURVILLE. and normally covering a, port in the former Witnesses: connecting with the latter and an arm con- M. B. ODOGHERTY,

1o neoted to said Valve projecting into the path H. C. SMITH. 

